A Letter from the Rev. Nevil Maskelyne, M. A. F. R. S. to William Watson, M. D. F. R. S.

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yi. A Letter from the Rev. Nevil Mafke-
Ijne, M. A. F. R. S. to William Watfon,
ikf, D. F. R. S.

^ w ^ Prince Henry, St Helen's Road,

S I R, Jan! 17, ifH.

Eead Jan 22, TN a ktter whicH I wrote to you from
^^ ^* i this place, the beginning of this week>
1 defired yo-JwoulS, in your a^fwerfo Abb^ De !a
CaiJle, acquaint him, that I had propofed to the
Royal Society the obfervations of the raoon*s paral-
lax, before his letter came; and that Dr. Bradley
was to make obfervations at Greenwich, correfpondent
to mine at St. Helena; and that I was drawing up a
lift of the proper obfervations to be made, itnd the
proper ftars with which the moon was to be com-
pared, which I propofed to tranfmit to the Abbe
De la Caille, in order that he might attend to the
fame obfervations, if he thought proper. But as he
has made out a lift of proper opportunities of ob-
ferving, I fhall only fet down five obfervations to be
added thereto, which I beg you will tranfmit to the
Abbe De la Caille ; and Ukewife deliver a copy of the
fame to Dr. Bradley.

I alfo defired in my letter, that you would defire
the Abbe De la Caille, and the other French aftro-
nomers by him, to attend to the obfervations of the
eclipfes of Jupiter's fatellites, efpecially the firft, from
May 1 76 1 to June 176a, inclufive, in order to fettle
the difference of longitude between Pads and St. He-
lena; which it it came in the name of the Society,
it would be better j and that you would alfo deliver

It

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it as my requeft to the Society, that d^y would re-
commend it to my Lord Macclesfield, Dn Bradley,
Mr. Raper, and Mr. Short, and any other gentle-
men they know propofe to attend carefully to the
obfervation of the tranfit of Venus, to make as many
obfervations of the eclipfes of the fatellites as they
conveniently can, in order to fettle the difference
of longitude between their place of obfervation and
and St. Helena, in the moft exacS manner j which is
of the utmoft importance with refpeft to the ufe to
be made of the obfervations of the tranfit of Venus.

We failed from hence lafi: Tueiday^ but the wind
not holding, returned hither again the next day.
We are now under way again ^ but doubt whether
the wind will ferve for us. I am forry to hear of the
accident, which befel the Sea-horfe, though they
came off vidojrs. I hope it will not flop their voyage i
for I learn, that if they fail in a fortnight, they may
ilill be in time.

I am.

Your obedient

humble fervant,

N. Mafkelyne.

E 2 17^2.

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VII. A Dijfertatim upon a Samnite Dena-
riusy mver before puhlijhed. In a Letter
to the Rev. Thomas Birch, D,D. Secre-
tary to the Royal Society ^ from the Rev.
John Swinton, B. D. of Chrift-Church,

#^' Tt^ W% Ck

Uxon* jTi ic» Om

Reverend Sir,
mead Jan. 15* ^INCE the Communication of my laft
an z% 1761. j^ paper to the Royal Society, I have
met with another Samnite denarius 1 which will, in
a great meafure, confirm what I endeavoured to
evince in that paper. This inedited filver coin is
adorned with two Etrufcan infcriptions, that very
well merit the attention of the learned. It is of the
iize of the larger confular denarii, difcovers much of
the Roman tafte, and is in the fineft confervation.
On one fide it exhibits a galeated head, in all refpeds

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